JP2881464B2 - Method of bending forming a sliding material of a sliding brush - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a sliding brush widely used as a metal sliding brush used for a micromotor, a resistor and the like.

[Prior art] Micromotors, resistors, etc. tend to be miniaturized, and in order to cope with this, a sliding brush is formed by bending a substantially middle part of a plurality (many) of wires (sliding materials) into a V-shape. It is desired that the molding has a spring property for shortening the length of the brush portion and for stabilizing vibration absorption and contact pressure during sliding.

As shown in FIG. 7 (b), a conventional sliding brush obtains a sliding brush unit 3 having a flat wire 2 having a bent portion having an R shape and a V-shaped bent angle on a pedestal 1 of the brush assembly. As shown in FIG. 7 (a), pedestals 1 are provided at substantially equal intervals on one side via a connecting portion 6 on a strap 5 made of a long substrate 4 and a flat wire 2 Uses a resistance welded to a certain length. Here, a round pilot hole 9 is formed in the suspension band 5 at an equal interval with the pedestal 1, and the pilot hole 9 is transferred to a press die by a device that sequentially and intermittently feeds the pilot hole 9 as a pilot guide. L-shaped molding, V-shaped molding, bending molding of correction molding,
Thereafter, the pedestal 1 was cut at the connecting portion 6 to obtain a single sliding brush.

The press die bending device used for V-shape molding has a curvature R part, so that the punch and die positional relationship is always maintained correctly and accuracy uniformity is maintained in order to satisfy strict standards in terms of accuracy. Die set. FIGS. 5 (a) to 5 (c) are schematic side cross-sectional views of the combined shape of the punch, die and block incorporated in the die set.
FIG. 5 (a) shows an L-shaped molding performed in the first bending process,
The punch 11 with the inside R in the die plate 10 is pushed up from below by a cam mechanism (not shown), and the flat wire 2 is formed so as to contact the right-angle forming die 12 with the outside R. Next, as shown in FIG. 5 (b), V-shaped forming of the second bending is performed,
An angle punch 13 fixed to a punch plate (not shown) is lowered from above, and is formed into a V-shape by the holding die 14 with the inside R and the angle forming block 15 with the outside R so as to sandwich the flat wire 2. Next, in order to secure the angle forming as the sliding brush and the curvature R portion by the correction forming of the third bending work shown in FIG. 5 (c), an inner radius attached to a punch plate (not shown) is fixed. Angle correction punch 16 descends from above,
Correction holding die 17 with inside radius and angle correction block 18 with outside radius
Then, the flat wire 2 is formed into a V-shape of the final shape.

As shown in FIG. 6, the displacement from the first bending process to the third bending process in which a series of bending processes is performed is as follows: the flat wire 2 is first bent at a right angle from point A to point B. Springback from point to point C (elastic recovery of plastic deformation)
Formed in a V-shape from point C to point D in the second bending process, but is displaced from point D to point E by springback (phenomenon) in the same manner as described above.
From point F to point F, it is displaced from point F to point D by springback, and the standard dimensional angle D
From the point, the point G is obtained. Incidentally, the springback amount in each angle forming here is within θ = 10 °.

Therefore, in the above method, the number of molding members used is large,
There is a disadvantage that the device becomes large. In addition, it is necessary to prepare various punches, dies, and blocks. In addition, the number of punches, dies, blocks, etc. is determined while performing step-by-step punching presses in consideration of springback, and adjusting the dimensions. Therefore, there is a problem that the adjustment of the mold takes a long time.

[Problems to be solved by the invention]

Thus, the present invention does not use multiple devices,
An object of the present invention is to provide a method of manufacturing a sliding brush that can easily bend a plurality of wires and that employs a bend that does not cause distortion or the like in a bent portion.

[Means for solving the problem]

The present invention uses a mechanism that operates a forming punch having the same bending angle as a brush bending forming die block from a direction perpendicular to the lower bevel of the wire without once bending the wire in a direction perpendicular to the wire. This is based on the finding that the above-mentioned problem can be efficiently solved by bending and forming at once at an angle obtained by adding the angle of springback to the angle.

That is, the present invention is a method for bending forming a sliding material of a sliding brush in which a sliding material is welded to a pedestal, wherein a pedestal and a male die block for bending forming are provided between a fixing die plate and a bending-forming male die block. A step of clamping a part of the sliding material, and raising a female forming punch having a desired bending angle from the front obliquely below the sliding material obliquely and pressing the sliding material against the male die block for bending molding. The above-mentioned method is provided, wherein a step of performing bending by attaching is provided.

Next, a method of manufacturing a sliding brush according to the present invention will be described with reference to the drawings. FIG. 2 (a) is a schematic plan view showing a manufacturing sequence, and FIG. 2 (b) is a perspective view of a sliding brush 3 bent in a V-shape. In FIG. 2 (a), a substrate 4 is made of, for example, a phosphor bronze alloy and has a thickness of 150 μm, a width of 5.0 mm, and a length of 20 m (arbitrary length). A pedestal 1 is connected, and a row of sliding members 2 (sliding material) made of, for example, an Ag-Pd alloy, which is in a row near the tip 8 of the pedestal 1 and is parallel to the suspension band 5 and is later resistance-welded. The projection 7 is formed and arranged so as to conform to a cross section of any shape such as a circle or a rectangle, but preferably matches a rectangular wire. The plate-shaped suspension band 5 has a diameter of 2.0 mm perforated at intervals of 7.0 mm in the longitudinal direction on both left and right sides.
The pilot hole 9 is sequentially and intermittently transferred by a feeder (not shown) as a pilot guide, and then is wound around a reel (not shown) from a direction perpendicular to the strap 5.
A long rectangular wire 20 composed of three metal sliding members having a thickness of 0 μm and a thickness of 70 μm is transported and arranged below the pedestal 1 at intervals of 100 μm, and is resistance-welded to the projection 7. Later, the length from the tip 8 of the base 1 to the broken line 21 is 5.0 mm.
And the rectangular wire 2 is obtained.

The substrates 4 sequentially assembled and transferred in such a process are introduced into a press die. Here, the bending standard dimensions of the sliding member 2 to be bent (hereinafter, the rectangular wire 2 will be described) are, for example, an inner angle R300 ± 50 μm and an inner angle θ = 55.
± 2 °. The V-shaped forming of the bending process in the press die for obtaining this dimension is performed by the steps shown in the schematic side sectional views of FIGS. 1 (a) to 1 (c). Here, (a) shows the fixing die plate 30 and the inclination angle θ = 30 ° and the outer angle R300.
FIG. 4 shows a view in which the flat wire 2 is disposed between V-shaped forming male die blocks 31 formed with μm, and is inclined in a direction perpendicular to the suspension band 5 with a downward slope θ ₁ = 30 ° inside. R390μm
An R-shaped female forming punch 33 having an R is disposed on a slide groove receiving block 42 which is separated from the die plate 30. Have. By actuating this, it is moved forward, and as shown in FIG. 2 (b), it contacts the outer angle R of the forming die block 31 with the position 4.0 mm from the tip of the flat wire 2 as a bending fulcrum, and is wound, for example, in a bending direction. The rectangular wire 2 is formed in a V shape in the direction. Next, FIG. 3C shows the state after the forming punch 33 with the R is retracted and the rectangular wire 2 is formed.

Thereafter, as shown in FIG. 1 (d), the suspension belt 5 is held by the suspension holder pressing plate 36 and the lower cutter block 37 in the same mold.
The connecting portion 6 of the pedestal 1 is separated by the upper cutter 38 along the cutting line 24 to obtain the sliding brush 3.

Regarding the displacement of the series of bending in the first embodiment,
As shown in the figure, when the bending process of the present invention forms a V-shape at an angle θ = 150 ° from the H point to the I point, springback occurs at an angle θ = 25 ° from the I point to the J point. The angle θ from the point to the point L is 125 °.

In the present invention, it is preferable to use the apparatus shown in FIG. Where 41 is the upper lid, 42
Is the receiving block with slide groove, 43 is the cylinder holding bracket, 44
Indicates a cylinder, and 45 indicates a stopper adjusting screw.

Next, a second embodiment will be described. In the second embodiment, using the same substrate 4 and apparatus as in the first embodiment, the substrate 4 is introduced into a press die, and the sliding member 2 is formed with an inner angle R300 ± 50 μm and an inner angle θ =
Curve to 90 ± 2 °. Fig. 1 (a)-Fig. 1 (a)
The process is performed by substantially the same process as the process shown in the schematic side sectional view of (c). Here, the flat wire 2 is disposed between the fixing die plate 30 and a V-shaped male die block 31 having a V-shape having an outer angle R300 μm formed at an inclination angle θ = 70 °.
The R-shaped female forming punch 33 having an inner radius of R390 μm is moved forward at a gradient of downward bevel θ ₁ = 70 ° in a direction perpendicular to the suspension band 5, and a position of 4.0 mm from the tip of the flat wire 2 is used as a bending fulcrum. The rectangular wire 2 is formed in a V-shape in the direction in which it is in contact with the outer corner R of the forming die block 31 and is bent. Next, the forming punch 33 with R is retracted, and the rectangular wire 2 is sprig-backed and formed into an L-shape.

Thereafter, the strap 5 is held by the strap holding plate 36 and the lower cutter block 37 in the same manner as in the first embodiment.
Is cut along the cutting line 24 by the upper cutter 38 to obtain the sliding brush 3.

Regarding the displacement of a series of bending in the second embodiment,
As shown in the figure, when the bending process of the present invention is formed in a V-shape at an angle θ = 110 ° from the H point to the K point, springback occurs at an angle θ = 20 ° from the K point to the L point, and H The angle θ from the point to the point L is 90 °.

In the present invention, as described above, the sliding brush can be bent into a U-shape or a substantially L-shape in addition to the V-shape, but the sliding angle is particularly preferably 30 to 90 degrees, preferably 30 to 70 degrees. It is suitable for bending a material.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to the method of this invention, since a sliding brush can be easily bent to arbitrary angles and shapes, and can be performed with a compact apparatus, there is a great industrial advantage. In addition, since the bent portion of the sliding member bent by the method of the present invention has little distortion, a bent sliding brush excellent in strength can be manufactured.

In particular, in the present invention, a mechanism is employed in which the female forming punch is operated in a manner to oppose the inclination angle on the male die block in a straight line, so that the female forming punch is structurally easily detached by removing the upper lid. Also, since the male die block can be easily removed from the die plate, there is an advantage that the labor for assembling and adjusting can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the method of the present invention, FIG. 2 is a schematic diagram showing the process of welding a wire to a strap and finally producing a sliding brush, and FIG. 3 is a diagram showing the method of the present invention. FIG. 4 is a diagram showing displacement of wire bending, FIG. 4 is a schematic diagram of an apparatus used for a first bending process according to the present invention, FIG. 5 is a schematic diagram of a method of forming a wire portion into a V-shape by a conventional method, and FIG. FIG. 6 is a view showing the displacement of the bending process of the wire rod according to the conventional method, and FIG. 7 is a schematic view showing a conventional process of welding the wire rod to the strap and finally producing a sliding brush. In the drawing, 1 is a pedestal, 2 is a sliding material (wire material), 3 is a sliding brush, 30 is a fixing die plate, 31 is a male die block for bending forming, and 33 is a female forming punch.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H01R 43/12 H01C 17/00 H01C 1/12

Claims (1)

(57) [Claims] 1. A method for bending and forming a sliding member of a sliding brush in which a sliding member is welded to a pedestal, wherein the pedestal and the sliding member are provided between a fixing die plate and a bending-forming male die block. A step of clamping a part of the moving material, and raising a female forming punch having a desired bending angle upward and obliquely from below the front of the sliding material and pressing the sliding material against the male die block for bending molding. The above method characterized by employing a step of performing bending by bending.